如何 f System.Data.Entity.Internal.InternalContext.SaveChanges()

Question

我有一個調用 Web 服務的 Windows 服務，然后將信息存儲在我的 t-sql 數據庫中。 在我的電腦中，此服務有效，但在另一台具有相同數據庫的電腦中，出現此錯誤：

[16:06:00] Teresa Gabriele: Errore saveLocalActivity:    in System.Data.Entity.Internal.InternalContext.SaveChanges()
   in System.Data.Entity.Internal.LazyInternalContext.SaveChanges()
   in System.Data.Entity.DbContext.SaveChanges()
   in GestoreService.Manager.Impl.AttivitaManagerImpl.saveLocalActivity(LOCAL_PE_Attivita attivita, Boolean saving) in c:\Users\michele.castriotta\Source\Workspaces\Omniacare\software\exercise platform\GestoreService\GestoreService\Manager\Impl\AttivitaManagerImpl.cs:riga 25
[16:06:52] Teresa Gabriele: Errore isAttivitaXMedicoExist:    in System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   in System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   in System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   in System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   in System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite)
   in System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite)
   in System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   in System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TInterceptionContext,TResult](Func`1 operation, TInterceptionContext interceptionContext, Action`1 executing, Action`1 executed)
   in System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand command, DbCommandInterceptionContext interceptionContext)
   in System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery()
   in System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass57.<ExecuteStoreCommand>b__56()
   in System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
   in System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass57.<ExecuteStoreCommand>b__55()
   in System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
   in System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreCommand(TransactionalBehavior transactionalBehavior, String commandText, Object[] parameters)
   in System.Data.Entity.Internal.InternalContext.ExecuteSqlCommand(TransactionalBehavior transactionalBehavior, String sql, Object[] parameters)
   in System.Data.Entity.Database.ExecuteSqlCommand(TransactionalBehavior transactionalBehavior, String sql, Object[] parameters)
   in System.Data.Entity.Database.ExecuteSqlCommand(String sql, Object[] parameters)
   in GestoreService.Manager.Impl.AttivitaManagerImpl.inserAttivitaXMedico(Int32 idAttivita, String codiceFiscaleOperatoreMedico, String username) in c:\Users\michele.castriotta\Source\Workspaces\Omniacare\software\exercise platform\GestoreService\GestoreService\Manager\Impl\AttivitaManagerImpl.cs:riga 192

這是代碼：

 _db.LOCAL_PE_Attivita.Add(attivita);
int result = _db.SaveChanges(); //LINE 25
if (result > 0)
return true;

Answer 1

問題不清楚，但我認為錯誤不在代碼中。 日志告訴該錯誤保存在 DB 中，但如果此應用程序僅在您的 PC 上工作，我認為（可能）與不同版本的 DB 相關。

檢查這是否是問題所在